Police on alert

Police on alert

Irfan Khan / Los Angeles Times

Corona police stand guard at Magnolia Avenue overpass of the 15 Freeway. Three officers were shot Thursday -- one in Corona and two in Riverside by a gunman believed to Christopher Jordan Dorner, the fired Los Angeles Police Department Officer wanted in the revenge slayings of a college basketball coach and her fiance in Irvine.

Corona police stand guard at Magnolia Avenue overpass of the 15 Freeway. Three officers were shot Thursday -- one in Corona and two in Riverside by a gunman believed to Christopher Jordan Dorner, the fired Los Angeles Police Department Officer wanted in the revenge slayings of a college basketball coach and her fiance in Irvine. (Irfan Khan / Los Angeles Times)

Corona police stand guard at Magnolia Avenue overpass of the 15 Freeway. Three officers were shot Thursday -- one in Corona and two in Riverside by a gunman believed to Christopher Jordan Dorner, the fired Los Angeles Police Department Officer wanted in the revenge slayings of a college basketball coach and her fiance in Irvine.